Top Definition
The butterfly shaped contents of a tissue, when you open and examine it after you've blown your nose, during a cold or fever.

Can be specifically used to freak out girls, mothers, and younger siblings.
Hey mum, look at my snotterfly!

I blew one hell of a snotterfly, and shoved it in my sister's face.
作者 Laudanum 2011年3月08日

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